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@@ Nucleostemin,which exists in stem cells and some malignant tumor cells,is highly expressed in various kinds of tumor cells such as leukemia cells.NS may play a significant role in the self-renewal and infmite proliferation state of stem cells and malignant tumor cells,and keeps cells in non-difierentiated state.To explore whether the apoptosis of leukemia cells could be induced by knocking—down Nucleostemin(NS)gene in vitro. The totallength of the synthesized NS-shRNA fNucleostemin specific short hairpin